Method of producing hollow ingots



{No Model.) 2 Sheets-Sheet 1.

J. T. ROWLEY! METHOD OF PRODUCING HOLLOW INGOTS,

No. 603,206. Patented Apr. 26, 1898.

- WITNESSES:

ATTORNEY.

(No Model.) 2 SheetsSheet 2.

J. T. ROWLEY. METHOD OF PRODUCING HOLLOW INGOTS. No. 603,206. PatentedApr. 26, 1898.

ATTORNEY.

UNITEDESTATES PATENT F CEo METHOD OF PRODUCING HOLLOW INGOTS.

SPECIFICATION forming part of Letters Patent No. 603,206, dated April26, 1898.

Application filed May 2'7, 1897. Serial No. 638,355- (No model.) i

To aZZ whom it may concern..-

Be it known that I, JOHN THOMAS RowLEY, a citizen of the United States,residing at Beaver Falls, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements inMethods of Producing Hollow Ingots; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertainstomake and use the same, reference being had to the accompanyingdrawings, which form a part of this specification.

My invention relates to a certain new method of manufacturing hollow ingots,which I shall describe with reference to the accompanying drawings,in which is shown a form of device or apparatus preferably adapted tothe application of my invention or discovery.

In the drawings, Figure 1 indicates a front elevation of said machine.Fig. 2 is a plan view of the same. Fig. 3 is an end view of the same.Fig. 4 is a vertical transverse section of the same. Fig.5 shows alongitudinal section and end view of an ingot produced by my method.

The device herein illustrated is in many respects similar to the machinepatented by me by Letters Patent No. 566,701, dated August 25, 1896. Iwill therefore not describe the same indetail, but only in so far as thesame varies from that shown in said- Letters Patent.

Referring to said drawings, A is a horizontal cylindrical roll mountedin suitable housings B B and adapted to be adjusted with reference tothe concave die-plate G by the bars or rods D D, the said roll beingarranged with reference to said concave back or plate,parallel therewithlongitudinally and preferably slightly eccentric to the contour thereof,so that the opening-pass between the top of said roll and the inner faceof said concave plate is somewhat greater than the exit-pass between thesaid two surfaces, so that the reduction of the ingot increasesprogressively from the entrance to the exit-pass.

In the practice of mymethod I take a heated blankoringot and place thesame in the pass between the roll and the concave die-plate, the sidesof said solid ingot being parallel with the faces of the roll and thediein the drawings.

plate. The rotation of the roll causes said peripherally while it isbeing reduced in diameter and increased in length, thus graduallyforming a hollow ingot.

My method consists, broadly, in first heating a solid bar or ingot,preferably octagonal or round in cross-section, then subjecting it tothe friction or pressure of two or more surfaces parallel with the axisof the ingot being operated upon, the bar or ingot being during theoperation free to rotate on its own axis, the billet or bar being freeto elongate, and this operation continued and the distance between thesurfaces decreased, if necessary, until, as before stated, the solid baris formed into a hollow .ingot of less cross-section and greater lengththan the solid ingot. practice of my method all of said surfaces may berotary, as when a series of rolls are used, or one of said surfaces maybe fixed and stationary, as in the form of device illustrated In eithercase the draft on the surface of the ingot must be sufficient to producea constantly-decreasing diameter and an elongation of the bar or ingot.

I have reduced my invention to practice.

Having described my invention, what I claim, anddesire to secure byLetters Patent, 1s-

1. The herein-described improvement in In the method for producinghollow ingots from solid friction or pressure of a plurality ofsurfaces, the said surfaces being parallel with the axis of the bar orbillet and adapted to progressively increase the reduction of the ingot,the 5 ingot or bar being free to rotate on its axis and to elongateduring the operation, substantially as described.

3. The herein-described improvement in method for producing hollowingotsfrom solid 10 bars or billets, which consists in first heating the solidingot, subjecting the same to the pressure of a roll and a verticalconcave dieplate, the billet or bar being free to rotate on its axis andto elongate during the operation, substantially as described. I 5

In testimony that I claim the foregoing I hereunto affix my signaturethis 25th day of May, A. D. 1897.

JOHN THOMAS ROWLEY. In presence of- JAS. J. McAFEE, O. A. WILLIAMs.

